Using WordPress ‘block_header_area()’ PHP function
The `block_header_area()` function in WordPress is used to display the header block template part by printing it directly using PHP
wp_head
Using WordPress ‘adjacent_posts_rel_link_wp_head()’ PHP function
Displays relational links for the posts adjacent to the current post for single post pages.
Using WordPress ‘get_index_rel_link()’ PHP function
The `get_index_rel_link()` function is used in WordPress to retrieve the site's index relational link
Using WordPress ‘is_robots()’ PHP function
How to Use the WordPress `is_robots()` Function in Your Theme or Plugin File